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I would suggest your crossover unit has failed in the speaker cabinet. The crossover circuit board separates the low and high frequency content of your stereos audio signal. The low frequencies go to the bass unit (woofer) and the high frequencies go to the tweeter speaker. If the capacitor on the crossover goes open or near open circuit then noise is introduced into the sound system. Replace either the capacitor or crossover unit.
The high limits are designed to shut the heater off if the water temp exiting the heat exchanger gets too high. One is set at 135f the other at 150f. The thermostat should shut the heater off once the pool water gets to temperature.
I'm not sure what you mean by "burning". The operating temp in a 400K btu heater is around 2000 degrees. If you are getting a lot of "sooting" that is typically caused by low gas supply. That's where you get orange flame instead of blue flame. Can you give me more detail?
As you have already replaced both flame sensor and ignitor & the problem is not solved so the problem is with the thermal fuse/thermostat going bad. Both these parts can be checked with a voltmeter for continuity. Please get back to me if you have any other questions.